260730721 has 4 divisors (see below), whose sum is σ = 261183172. Its totient is φ = 260278272.

The previous prime is 260730719. The next prime is 260730733. The reversal of 260730721 is 127037062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259564321 + 1166400 = 16111^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 260730721 - 2¹ = 260730719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 260730721.

It is not an unprimeable number, because it can be changed into a prime (260730781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225360 + ... + 226513.

It is an arithmetic number, because the mean of its divisors is an integer number (65295793).

Almost surely, 2^260730721 is an apocalyptic number.

It is an amenable number.

260730721 is a deficient number, since it is larger than the sum of its proper divisors (452451).

260730721 is an equidigital number, since it uses as much as digits as its factorization.

260730721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452450.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 260730721 is about 16147.1582948827. The cubic root of 260730721 is about 638.8477975213.

Adding to 260730721 its reverse (127037062), we get a palindrome (387767783).

The spelling of 260730721 in words is "two hundred sixty million, seven hundred thirty thousand, seven hundred twenty-one".